PELT Coating Thickness Gauge

The µP501A PELT and µP301 PELT (Pulse Echo Layer Thickness) from JSR-Imaginant are high resolution, multi-layer thickness measurement systems. These hand-held devices use state-of-the-art ultrasonic technology and are capable of picosecond resolution. The result is unparalleled precision and accuracy. Thickness measurements can be obtained on up to 5 different sub-layers of a coating system, with a resolution of down to 1 µm.

This advanced technology can be used to effectively monitor coating uniformity and for verification that applied coatings are within specification. Since measurements are quick and easy, more locations per part can be measured and the number of parts tested can be increased. The supplied Windows application software manages data transfer, displays the RF wavefrom, and allows ultrasonic waveform analysis. Optional Microsoft Excel-based reporting software allows visualization of thickness data in customized formats.

  • Non-destructive - No damage on measured parts
  • Reports the thickness of each individual layer (up to 5), and the total thickness
  • Excellent Gauge R&R
  • Compatible with most combinations of coatings (paints, plastics, composite metals, epoxies, rubber, …) and substrates (plastics, composites, wood, glass, metal, …)
  • Storage of up to 1000 data points (including RF waveform)
  • Result data (RF waveform, coating thickness) can be automatically transferred to a PC for storage and future analysis

Measuring method

 The PELT Gauge transmits an ultrasonic signal through one or more coated layers by placement of an ultrasonic transducer on the sample to be measured. A liquid couplant, such as water, is used to facilitate the transmission of the signal into the coating materials. As the signal crosses an interface between two adjacent layers, an echo is generated. Layer thickness is determined by the time difference (time of flight) between successive layer boundary echoes.

  • CC: Clear coat, thickness proportional to distance waveforms 1 – 2
  • BC: Base coat, thickness proportional to distance waveforms 2 – 3
  • PR: Primer, thickness proportional to distance waveforms 3 – 4
  • EC: Electro coat, thickness proportional to distance waveforms 4 – 5
  • S  : Substrate

PELT Characteristics

All PELT models are precise ultrasonic coating thickness gauges for measuring individual layer thicknesses of multi-layer systems. The PELT model µP301 is capable of handling up to 3 layers, while the µP501 model can be used for measuring individual layer thicknesses on systems with up to 5 layers.

  Model µP301 Model µP501
   Max. number of layers 3 5

± 1.3µm or ± 2% of measured thickness,

whichever is greater

   Resolution 1 µm
   Minimum thickness

Mid coatings: 10 µm

Single coatings: 15 µm

Top coatings: 25 µm

   Maximum thickness (material dependent)

Typical: 1.1 mm

Optional: 6.4 mm

HE: 10 mm

Typical: 1.1 mm
   Min. radius of curvature for tested surface

Convex: > 51 mm

Concave: > 153 mm

(with standard probe)


Lifetime: 8h

Recharge time: 1 h

   Dimensions 255 × 191 × 45 mm
   Weight (incl. battery) 1.6 kg